IOSR Journal of Mechanical and Civil Engineering (IOSR-JMCE) e-ISSN: 2278-1684,p-ISSN: 2320-334X, Volume 9, Issue 5 (Nov. - Dec. 2013), PP 36-46 www.iosrjournals.org www.iosrjournals.org 36 | Page Dynamic Analysis of Double-Skin Composite Steel Plates Mohamedien, A.R 1 , Omer, A.A 2 1 (Civil Engineering Department, Military Technical College. / Cairo, Egypt.) 2 (Mechanical Engineering Department, Military Technical College / Cairo, Egypt.) Abstract: Double Skin Composite (DSC) plates are subjected to impact required to cause complete perforation and the accompanied failure modes are investigated. The amount of energy absorbed is calculated by capturing the residual velocity of penetrator after perforating the lower plate. The difference in initial kinetic energy and residual kinetic energy is the amount of energy absorbed by the panel. In the present paper a non-linear three- dimensional finite element models for Double Skin Composite panels subjected to dynamic loading is introduced. Pilot model is used to investigate the failure pattern in the composite panel when subjected to impact loads by rigid steel penetrator, while the other models are used to analyze the energy absorption capacity of such system when perforated. Results showed that such elements have good ability of absorbing energy when subjected to perforation, due to ductility of lower plate skin and vertical stiffness of lower shear studs. Keywords: Double skin composite; Steel Plates; Concrete; Impact; Dynamic loading; Shear studs. I. Introduction The main problems facing the usage of reinforced concrete to resist impact loading that may cause penetration or perforation of slabs in buildings, shelters,….etc are much smallness in ductility of concrete slabs and needing of big slab thickness or great reinforcing steel ratio in slab section [1] H.D. Wright et. al. [2,3], investigated the experimental behavior of DSC elements by early pilot tests which were carried out on individual half scale and full scale models. The tests divided into three series dealing with beam behavior, column and eccentrically loaded column behavior and beam column behavior. T. M. Roberts et. al. [4], used the static test to investigate the behavior of DSC beams under series of quasi-static load tests. Their search also focused on the observed modes of failure that were yielding of tension and compression steel plates and slip of the tension plate connectors. All beams exhibited reasonably ductile behavior and many of the beams exhibited extensive shear cracking during latter stages of the tests. However, the shear cracking did not precipitate failure. N. E. Shanmugam, et. al. [5], describe finite element modeling of the ultimate load behavior of simply supported DSC slabs. The effects of shear studs were modeled indirectly by adjusting the shear stress parameter for the core material. The study provided a transformed section having the same structural stiffness and load carrying capacities. The results of the model in their study were very close to the results of their experimental tests except in some specimens, the reason was that the absence of a direct simulation of shear studs in the model. Also the buckling of steel plates did not appear. M. Xie et al. [6] investigated the shear behavior of friction-welded bar-plate connections embedded in concrete to model a push-out test with direct representation of shear connectors by solid elements. Perry et al. [7] discussed the factors influencing the response of fiber-reinforced concrete slabs to impact and noted that changing the amount of fiber reinforcement may change the mode of failure of the concrete. The unreinforced concrete tends to fail by shear punching. Steel-fiber reinforced concrete tends to fail by flexure and crushing of the concrete. Corbett & Reid [8] investigated the response of steel – grout sandwich plates to projectile impact; it was shown that sandwich plates made up of two 1mm thick steel skins separated by grout fillers with thickness ranging from 3 to 40 mm were not efficient enough to withstand projectile impact in terms of energy absorbed per density of steel plates. Corbett et al [9] investigated the resistance of steel-concrete sandwich tubes to penetration from hardened steel indentor. Concrete tubes were claded on their outer and inner diameters with 1mm thick steel skins and subjected to quasi static and dynamic loadings. The tested tubes had an inner diameter of 120 mm, concrete fillers of thickness 10, 20, 38 mm were examined. It was shown that the impact resistance of steel – concrete sandwich structures was less sensitive to projectile mass and nose shape than monolithic steel structures. In addition the resistance of the sandwich structures to projectile penetration was seen to be most effective when the rear face skin was undeformed which provides substantial support to the filling medium.
Dynamic Analysis of Double-Skin Composite Steel Plates
Jun 24, 2023
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